Note 9 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Investments in Affordable Housing and Alternative Energy Partnerships	$ 86,700	$ 89,300
Commitments To Extend Notional Amount	4,199,716	3,809,999
Commitments to Fund Fixed Rate Loans	54,400	48,400
Commitments to Fund Adjustable Rate Loans	$ 4,150,000	$ 3,760,000